There shouldn't be much of a cycle at all as all you're adding is new water and because the new rock/sand is dry I wouldn't imagine you'll see much of a cycle at all as there is no life pn the rock or sand to die off and create one.
Your tank critters will appreciate the large waterchange. Each of my tank moves/swaps/upgrades have involved new water additions of 30-50% (depended on how much RODI water I could make) and polyp extension and color was always much better for the first bit after setting up the tank (probly due to increased water clarity).
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